Invite your friends, if you see them playing, tell the to get off.
Post the group link to the Overkill posts, and give Payday2 bad reviews.
I'm afraid this is all we can do.
Don't give in, they're trying to lure us back in with "appealing" ♥♥♥♥ like the new heist.
If you haven't done Aftershock, let me summarize it: It's basically meltdown plus armored transport, minus all the good stuff, with a length shorter than Ukrainian Job.
Spread the word, and stay strong.